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Re: [Cose] Key management for MACs (was Re: Review of draft-schaad-cose-msg-01)

Brian Campbell <bcampbell@pingidentity.com> Fri, 10 July 2015 22:34 UTC

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From: Brian Campbell <bcampbell@pingidentity.com>
Date: Fri, 10 Jul 2015 16:34:05 -0600
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To: Jim Schaad <ietf@augustcellars.com>
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Subject: Re: [Cose] Key management for MACs (was Re: Review of draft-schaad-cose-msg-01)
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Really, there's no overhead from the key management part?



> I've admittedly not done the comparison but the message size overhead
> seems like it'd be similar with something like ECDSA (admittedly not RSA).
>
>
>
> ECDSA = 2 * SHA-256 or 32 bytes
>
> Truncated AES-CMAC is 8 bytes (64 bits)
>
>
>

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